Better error handling for list dir and cli

src/main.odin

@@ -8,39 +8,50 @@ import "src:file"
 
 VERSION :: #config(VERSION, "dev")
 
+CLI_ERR :: 1
+WORKING_DIR_ERR :: 2
+LIST_DIR_ERR :: 3
+WRITE_ASSETS_ERR :: 4
+WRITE_METADATA_ERR :: 5
+
+// -----------------------------------------
+
 main :: proc() {
-	working_dir := file.get_working_dir()
+	working_dir, wd_err := file.get_working_dir()
+	if wd_err != nil do os.exit(WORKING_DIR_ERR)
 	defer delete(working_dir)
 
-	opts := cli.parse(working_dir)
+	opts, c_err := cli.parse(working_dir)
+	if c_err != nil do os.exit(CLI_ERR)
 
 	// fmt.println("verbose:", opts.verbose)
 	// fmt.println("compression:", opts.compression)
 	// fmt.println("size:", opts.size)
 
-	entries := file.list_dir_recursive(opts.input, working_dir)
+	entries, e_err := file.list_dir_recursive(opts.input, working_dir)
+	if e_err != nil do os.exit(LIST_DIR_ERR)
 	defer file.delete_entries(&entries)
 
 	w := chunks.writer_init(cast(u64)len(entries))
 	defer chunks.writer_destroy(&w)
 
-	err := chunks.write_assets(
+	wa_err := chunks.write_assets(
 		&w,
 		opts.output,
 		entries[:],
 		opts.size,
 		opts.compression,
 	)
-	if err != nil do os.exit(1)
+	if wa_err != nil do os.exit(WRITE_ASSETS_ERR)
 
-	chunks.write_metadata(
+	wm_err := chunks.write_metadata(
 		&w,
 		opts.output,
 		entries[:],
 		opts.size,
 		opts.compression,
 	)
-	if err != nil do os.exit(2)
+	if wm_err != nil do os.exit(WRITE_METADATA_ERR)
 }
 
 // TODO: .chunkignore